How To Change Boost On A Apexi Avcr

[RB SANDY]

how to change boost setting on a apexi avcr on mode A the car r33 s2 rb25 goes to 10 psi and after 5500rpm in shoots up to about 19

i want to try and set in to 15 the hole time on mode a also quick spool up

Thanks

[Col-GTSX]

AVCR's are great once you have a base line...

If its spiking all over the shop that means your gain is set way to high...

lower both values on the avcr and then just increase the base line until you have good gradual control over the boost...

then just adjust the value until you get your desired 15psi, always trust a separate boost gauge tho dont realy on the avcr to tell you wants going on...

atl, have a google for an english manual and it explains boost spiking and gain setting much better than i can

[RB SANDY]

could you have a look at the vid is the guy in the right spot to change the boost and is the 2nd part the gain

[Col-GTSX]

so i never used the scramble function as never needed it and i never used the self learning modes...

I always used mode number 1.Boost/Duty

So just to get a base line, reset the unit and start from scratch...

Set the Bst value to 1.05kg/cm2 and set the gain to about 10

Then go for a drive and watch you separate boost gauge and see what happens...

If it comes on way to hard and too fast for you drop the gain down, if it takes way too long to get to full boost then turn the gain up a bit (little changes like 3-4 at a time)

Once your happy with the gain and the way the car boosts then adjust the kg/cm2 value up of down (once again in small changes) until you hit the sweet spot...

Just remember a high gain will cause boost spiking as the valve in the boost solinoid will bounce and create boost spikes, so keep the gain value as low as possible without loosing performance and thrill...

[RB SANDY]

sory to be a pain but where to you go to cange the gain

thanks alot

[paulr33]

sandy

the duty is the ratio of the solenoid being opened and closed

so a higher value, means the solenoid is closed more, which means it holds more boost

the lower the number, the less you should have, well as least inline with the target boost

so if you set say 1.0kgcm2 and 50 duty

and it ramps to 1.2kgcm2 instantly your duty is too high, ie: it's closed too much, and the actuator doesnt progressively open enough, so it opens finally, and its too late, its way over

so if you set say 1.0kgcm2 and 30 duty

and it climbs slowly but only gets to 0.80kgcm2 your duty is too low, ie; its open too much, and the actuator opens early and just lets all the pressure out

[Col-GTSX]

under the very first option on the avcr is number 1:boost/duty

duty = gain

apexi call it duty and everyone else calls it gain

sorry about that sandy, i kept thinking gain as its the more common termoniligy

[RB SANDY]

thanks alot guys i will have a play